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Sporadically, there are link losses with mvBlueLYNX or network speed is slower than expected

mvBlueLYNX

Please check, if the switch supports "autonegotiation" and if it is enabled. If this should not be possible, the mvBlueLYNX" network interface has to be set to the same value. This could be done with mii-tool.

E.g. "link partner : 100baseTX-HD" would be a output of a link partner who does not support FD (unusual normally). This could be the case, if an old hub is used, the autonegotiation fails for unknown reasons or the link partner only allows this mode.

Using mii-tool, you can set the link without autonegotiation, for example, 100baseTx-FD.

./mii-tool --force 100baseTx-FD

With

./mii-tool -w

you can display the link state changes. E.g.:

> eth0: 100 Mbit, full duplex, link ok

Disconnecting the network cable:

> eth0: 100 Mbit, full duplex, no link

Connecting the network cable:

> eth0: 100 Mbit, full duplex, link ok

If you reset to autonegotiation with

> ./mii-tool -r

and afterwards trace the link change with

mii-tool -w

, you will see while disconnecting and connecting the cable, that autonegotiation is done every time.